I put some electrical tape around the post and helps. It's just very disappointing for something you pay so much for. In comparison, I bought the Zeikos for my D90 and it doesn't have the same issue. Oh, and I paid only 50 bucks for it.
I get the same "slop". Barely moves a fraction of a millimeter but enough to be annoying. It appears that many have this problem when I do a search. Seems many are coming up with clever ways to fix this...many are adding a thin piece of rubber to tighten everything up.